JPH0230939B2 - GAIMENTOSOIKEIKANTAI - Google Patents

Description

[Detailed description of the invention]

FIELD OF THE INVENTION The present invention relates to an exterior-painted irregularly shaped casing.
More specifically, the present invention relates to an exterior-coated irregular-shaped case with excellent scratch resistance, external appearance characteristics, and rust resistance. BACKGROUND TECHNOLOGY AND TECHNICAL PROBLEMS OF THE INVENTION Conventionally, various types of bottles have been known as containers in which the cross-sectional diameter of the container changes in the axial direction of the container. With the improvement and diversification of cans, there is a demand for the development of cans whose cross-sectional diameter changes in the axial direction of the can, that is, irregularly shaped cans. In the case of normal cans, even so-called three-piece cans,
Even in a two-piece can, most of the outer surface of the can body has a constant diameter and its axial cross section is substantially straight.
In the case of canned cans whose axial cross section on the outer surface of the can body is straight, during transportation, adjacent cans come into contact over the entire axial length of the outer periphery of the can body, so that so-called sagging on the outer surface may occur. There is almost no discernible tendency for this to occur. However, in the case of the above-mentioned odd-shaped case, adjacent cans come into contact only at the overhanging part of the outer periphery of the can body, that is, the large diameter part, and furthermore, when the canned packaging pack is transported, this odd-shaped case cannot be moved inside the pack. As a result, the paint on the outer surface of the can body gets scratched due to scratches due to the top movement and rising phenomenon (axial movement).
This results in disadvantages in that the appearance becomes poor or rust occurs in this part, resulting in a loss of commercial value. Particularly in the production of irregularly shaped cans, a cylindrical can body is manufactured by rolling a painted and externally printed metal material for cans and forming side seams, and a segment is inserted into this can body to create a tapered shape. Generally, a method is employed in which the segments are spread apart using pins to stretch out at least a portion of the outer periphery of the can body. During this stretch molding, the paint film on the outer circumferential surface of the can body is also subjected to tensile deformation, and if there are scratches or potential scratches on the paint film due to this tensile deformation, the scratches due to scratches mentioned above are particularly noticeable. Become something. OBJECT OF THE INVENTION Therefore, an object of the present invention is to provide an exterior-coated irregular-shaped case that suppresses the occurrence of scratches on the coating film on the overhanging portion of the outer circumferential surface of the case, and has significantly superior appearance characteristics and rust resistance. There is something to do. Another object of the present invention is to suppress the occurrence of scratches or potential scratches on the outer coating film during stretch molding of the can body, and to provide a varnish layer that is excellent in retaining the lubricant layer. The purpose of the present invention is to provide a special case with a painted outer surface. Still another object of the present invention is to provide an exterior-coated irregular-shaped case having excellent appearance and commercial value. Structure of the Invention According to the present invention, there is provided an irregularly shaped can having a can body having a portion having a diameter larger than the lid tightening diameter, and in which the can body diameter changes in the axial direction of the can body, A thermosetting finish varnish layer with a glass transition temperature (Tg) in the range of 50 to 80℃ is applied to the outer surface of the case, and a dynamic friction coating is applied to the finish varnish layer of the can body, which has a diameter at least larger than the lid seam diameter. Provided is an outer surface-painted irregularly shaped housing characterized by being provided with a lubricant layer having a coefficient of 0.05 or less. PREFERRED EMBODIMENTS OF THE INVENTION The present invention will be described in detail below based on specific examples shown in the accompanying drawings. Structure of the Case In FIGS. 1 and 2 showing an example of the externally painted irregular-shaped case of the present invention, the case has a cylindrical can body member 1 with openings at both ends, and a top and bottom end of the can body member 1. , and can lids 3a and 3b that are seamed through double seams 2a and 2b, respectively. The upper can lid 3a is provided with an easy-open mechanism 4, which is known per se. In the upper part of the can body member 1, there is an upper small diameter part 5 having approximately the same diameter as the cylindrical blank before being subjected to stretch forming.
Also at the lower part of the can body member 1, there is a lower small diameter portion 6 having approximately the same diameter as the cylindrical blank. In this specific example, further below the lower small diameter portion 6 is a neck portion 7 which is neck-in-processed to have a diameter smaller than that of the lower small diameter portion 6.
Double seaming with the lower can lid 3b is performed. Below the upper small-diameter part 5, there is a large-diameter overhang part 9 whose axial cross section bulges outward in an arc shape through a stepped shoulder part 8 having a large diameter. Also above the large-diameter projecting portion 9 is a projecting portion 11 having a smaller diameter than the large-diameter projecting portion 9 via a step shoulder portion 10 having a larger diameter. A smooth recess 12 having a smaller diameter exists between the large-diameter projecting portion 9 and the small-diameter projecting portion. This recess 12
has approximately the same diameter as the upper small diameter portion 5 and the lower small diameter portion 6. As will be detailed later, this can body member 1 is formed by forming the portion between the upper small diameter portion 5 and the lower small diameter portion 6 by stretch molding using an expander, and the periphery of these portions is as follows. As clearly shown in the enlarged sectional view in FIG. 3, when viewed in radial cross section, it consists of a large number of arcuate sectioned sections 13 and short straight or slightly concave sections 14 interposed between them. . Furthermore, this profiled housing is provided with a welded side seam 15 in connection with the fact that it is obtained by stretch forming a welded cylindrical blank. Thus, the irregularly shaped case of this specific example has portions 9 and 11 with a larger diameter than the lid fastening parts 2a and 2b, and the diameter of the can body changes in the axial direction of the can body, so that it looks like a goblet as a whole. It will be understood that it has a unique appearance similar to. In FIG. 4, which shows an enlarged cross-sectional structure of the large-diameter projecting portion 9 of the can body member 1, the can body is made of a metal material 16 for the can, such as tinplate, and the inner surface thereof has a metal material 16 for the can. An organic base coat layer 17 and an organic top coat layer 18 are provided. Further, a printing ink layer 20 is provided on the outer surface of the metal material 16 via a base coat layer 19, and a finishing varnish layer 21 and a lubricant layer 22 are provided thereon. According to the present invention, a thermosetting finishing varnish layer having a glass transition temperature Tg in the range of 50 to 80° C. is used as the finishing varnish layer 21, and on top of the finishing varnish layer 21 of the large-diameter projecting portion, It is important to provide a lubricant layer 22 with a dynamic friction coefficient of 0.05 or less in order to improve the scratch resistance of the outer surface of the irregularly shaped casing. Finishing varnish and lubricant In this specification, glass transition temperature Tg means
It refers to the value measured by the penetration method, and more specifically, it uses a thermomechanical analyzer manufactured by Rigaku Denki Co., Ltd. to directly measure the baked coating film formed on the object to be coated by the penetration method. Say the value you get. In the present invention, first, it is important to use a thermosetting finishing varnish as the finishing varnish. This is because thermosetting varnish exhibits excellent adhesion to the underlying base coat layer 19 and the printing ink layer 20 thereon, and this excellent adhesion also
This is because it is maintained even after stretch-molding a cylindrical blank of painted metal material. First of all, what is important in overhanging painted metal materials is the adhesion of the finishing varnish to the metal material, and if this adhesion is impaired by overhanging, the physical properties of the paint film and the application of lubricant may be affected. No matter what happens, no improvement in the scratch resistance of the coating film can be expected. It is also very important that this thermosetting finishing varnish has a glass transition temperature in the range of 50 to 80°C. That is, conventionally, finishing varnishes applied on the printing ink layer on the outside of cans are required to have gloss, scratch resistance, etc., and therefore varnishes with a high glass transition temperature Tg, generally higher than 80°C, are used as finishing varnishes. Finishing varnishes have been used. However, finishing varnishes with such high glass transition temperatures easily cause scratches and other flaws when overhanging coated metal cylindrical blanks, and even if no obvious coating cracks occur, they can cause latent damage. Scratches may occur, causing rust and a decrease in product value. In the present invention, in order to prevent coating film cracking during stretch molding, the glass transition temperature of the thermosetting finishing varnish must be set at 80°C.
The following range is critical. The lower limit of the glass transition temperature Tg is determined for another reason. That is,
When the Tg of the finishing varnish is lower than 50°C, there is a strong tendency for the so-called can manufacturing scratches to occur during the above-mentioned stretch molding. These can manufacturing scratches are scratches that easily enter the upper surface of the finishing varnish layer due to the softness of the surface of the finishing varnish.When these scratches occur, the surface gloss caused by the finishing varnish is lost, and the product value also decreases. . In the present invention, thermosetting finishing varnish
By selecting Tg within the above-mentioned range, the occurrence of scratches or potential scratches during severe stretching processing can be completely eliminated. In the present invention, by using a thermosetting finishing varnish with a Tg of 50 to 80°C, unexpected advantages other than those mentioned above are achieved. In other words, the above-mentioned thermosetting finishing varnish has an excellent effect of preventing the occurrence of scratches during overhang processing, but on the other hand, it is relatively weak against abrasion, and the above-mentioned scratches during transportation etc. The disadvantage is that the outer coating is extremely susceptible to damage. From the standpoint of preventing this, it is important to apply a specific lubricant layer. A thermosetting finishing varnish with a Tg of 50 to 80°C has the unique effect of retaining the lubricant layer applied thereon and sustaining the lubricating action over a relatively long period of time. The reasons why the effect of the lubricant cannot be obtained stably over a long period of time are that the lubricant on the finishing varnish separates from the finishing varnish surface and migrates to other areas, causing the lubricating effect to be lost. Two possible causes are that the lubricant penetrates into the finishing varnish and the surface lubrication effect is lost. The reason why the finishing varnish used in the present invention exhibits an excellent lubricating effect is because the finishing varnish exhibits excellent retention of the lubricant layer within the limit where the lubricant does not penetrate excessively into the varnish. Is recognized. The lubricant layer used in the present invention has a dynamic friction coefficient of 0.05.
Must be: In this specification, the coefficient of dynamic friction refers to a value determined by a three-point loading method using a dynamic slip tester using a sample of a finished varnish coated object with a lubricant layer applied thereto. A lubricant layer with a dynamic friction coefficient greater than 0.05 is less effective in preventing scratches caused by scratches during transportation of irregularly shaped cases. In the present invention, the glass transition temperature is 50 to 80°C.
As the thermosetting finishing varnish within the above range, an appropriate one is selected and used from the standpoint of resin composition and baking conditions. The most suitable example of the resin composition is one consisting of an epoxy ester resin, ie an ester of an epoxy resin and a long chain fatty acid, in combination with an amino resin as a curing agent. Examples of the epoxy resin constituting the epoxy ester include bisphenol type epoxy resins whose epoxy equivalent is generally within the range of 450 to 4000, and examples of fatty acids include oleic acid, linoleic acid, linoleic acid, polymerized fatty acids, etc. In addition, soybean oil fatty acids, cottonseed oil fatty acids, safflower oil fatty acids, tall oil fatty acids,
Flaxseed oil fatty acids, castor oil fatty acids, coconut oil fatty acids, palm oil fatty acids, etc. are used. Esterification of epoxy resins with fatty acids is carried out by cumming them, but the fatty acid modifier is
The epoxy ester is used in an amount of 45 to 45 equivalent percent, and contains one or more but less than two epoxy groups in one molecule of the resin. Examples of the amino resin used as a curing agent include amino resins known per se such as urea formaldehyde resin, benzoguanamine formaldehyde resin, and melamine formaldehyde resin. In the finishing varnish having the above composition, the Tg of the finishing varnish tends to increase as the amount of the amino resin component increases. The preferred composition varies slightly depending on the baking conditions of the coating film, but it is best to use the epoxy ester and amino resin in a weight ratio of 100:0 to 50:50, especially 90:10 to 60:40. . Another suitable example of the thermosetting finishing varnish is a thermosetting acrylic resin varnish.
Any known thermosetting acrylic resin can be used, but a typical example is an acrylic resin containing a carboxyl group or an acid anhydride group and a hydroxyl group in its molecular chain. . Monomers providing acid groups or acid anhydride groups include:
Acrylic acid, methacrylic acid, crotonic acid, itaconic acid, citraconic acid, fumaric acid, maleic acid, maleic anhydride, itaconic anhydride, etc. can be mentioned, and monomers providing hydroxyl groups include 2-
Examples include hydroxyethyl acrylate (methacrylate), 3-hydroxyethylpropyl-acrylate (methacrylate), 4-hydroxybutyl-acrylate (methacrylate), and methylolated acrylic (methacrylic) amide. The monomer components that make up the skeleton of acrylic resin include methyl acrylate (methacrylate), ethyl acrylate (methacrylate),
One or more of acrylates (methacrylates) such as butyl acrylate (methacrylate); vinyl aromatics such as styrene and vinyltoluene, acrylonitrile, methacrylonitrile, and ethyl vinyl ether can be mentioned. The glass transition temperature of a thermosetting acrylic resin also differs depending on the concentration of reactive groups and the type of main monomer forming the resin skeleton. Resins containing lower alkyl esters such as methyl methacrylate or monomer components such as styrene provide Tg in a good range. The concentration of acid or acid anhydride groups in the acrylic resin is preferably in the range of 10 to 400 mmol/100 g of resin, and the concentration of hydroxyl groups in the resin is preferably in the range of 10 to 400 mmol/100 g of resin. Suitable examples of lubricants with a dynamic friction coefficient of 0.05 or less are:
Examples include, but are not limited to, the following: 1 Aliphatic hydrocarbon liquid paraffin Industrial white mineral oil Synthetic paraffin Petroleum wax Petrolatum Odorless light hydrocarbon 2 Silicone Organopolysiloxane 3 Fatty acids, fatty alcohols Higher fatty acids Fatty acids obtained from animal or vegetable oils and hydrogenated fatty acids Added products with a carbon number of 8 to 22 Hydroxystearic acid Straight chain aliphatic monohydric alcohol Products with a carbon number of 4 or more obtained by reducing animal or vegetable oils or their fatty acid esters or decomposing and distilling natural waxes , Tridecyl alcohol 4 Polyglycol Polyethylene glycol Those with a molecular weight of 200 to 9,500 Polypropylene glycol Those with a molecular weight of 1,000 or more Polyoxypropylene-polyoxyethylene-block polymer Those with a molecular weight of 1,900 to 9,000 5 Amide, amine Higher fatty acid amide Oleyl palmitamide Stearyl erucamide 2 stearomide ethyl stearate Ethylene bis fatty acid amide NN'Oleoyl stearyl ethylenediamine NN'Bis(2hydroxyethyl)alkyl ( _C12 - _C18 ) amideNN'Bis(hydroxyethyl)lauroamide N alkyl ( _C16) ~C ₁₈ ) Oleic acid reacted with trimethylene diamine Distearate ester of fatty acid diethanolamine di(hydroxyethyl) diethylenetriamine monoacetate 6 Fatty acid ester of monohydric and polyhydric alcohol n-butyl stearate Hydrogenated rosin methyl ester Dibutyl sebatate <n-Butyl> Dioctyl sebatate <2-ethylhexyl, n-octyl> Glycerin fatty acid ester Glyceryl lactostearyl pentaerythritol stearate Pentaerythritol tetrastearate Sorbitan resin acid ester Polyethylene glycol fatty acid ester Polyethylene glycol monostearate Polyethylene glycol dilaurate Polyethylene Glycol monooleate Polyethylene glycol dioleate Polyethylene glycol coconut fatty acid ester Polyethylene glycol tall oil fatty acid ester Ethanediol montanate 1,3-butanediol montanate ester Diethylene glycol stearate ester Propylene glycol fatty acid ester 7 Triglycerides, waxes Hydrogenated edible fats and oils Cottonseed oil and other edible oils Linseed oil Palm oil Glycerin ester of 12-hydroxystearic acid Hydrogenated fish oil Beef tallow Spam acetiwax Montan wax Carnauba wax Bees Wax Wood Wax Monohydric aliphatic alcohols and aliphatic saturated acid esters <Example: Hydrogenated whale oil lauryl stearate, stearyl stearate> Lanolin 8 Salts of higher fatty acids with alkali metals, alkaline earth metals, zinc and aluminum (metal soap) 9 Low molecular weight olefin resin Low molecular weight polyethylene Low molecular weight polypropylene Polyethylene oxide 10 Fluorine based Resin Polytetrafluoroethylene Tetrafluoroethylene/Hexafluoropropylene copolymer Polychlorinated trifluoroethylene Polyfluorovinyl 11 Others Propylene glycol alginate Dialkyl ketone Acrylic copolymer (for example, Modaflow manufactured by Monsanto, etc.). Among these lubricants, liquid paraffin and silicone oil are particularly suitable for the purpose of the present invention. It is noteworthy that in the present invention, these lubricants maintain sufficient mar resistance and durability even when applied in very thin layers. Satisfactory results can be obtained with a very small coating amount of the lubricant layer, such as 0.3 to 5 mg per unit surface area (dm ² ) of the can. On the other hand, the thickness of the finishing varnish is 70 to 100 mg/dm ² , especially 77 to 93 mg/dm 2 .
mg/dm ² gives satisfactory results. Manufacturing method Various surface-treated steel plates and light metal plates are used as the metal materials used to manufacture the irregularly shaped casing of the present invention. Various surface-treated steel sheets include, for example, tin-plated steel sheets (tinplate), galvanized steel sheets, aluminized steel sheets, nickel-plated steel sheets, chrome-plated steel sheets, and other plated steel sheets; electrolytically treated steel sheets such as electrolytic chromic acid-treated steel sheets; phosphoric acid and/or chromic acid-treated steel sheets; Examples include chemically treated steel sheets such as treated steel sheets, aluminum,
A light metal plate such as an aluminum alloy or a composite material thereof is used. In particular, tinplate with good stretch formability is used, especially the amount of tin plating is 28 to 8.4.
g/m ² of tinplate may be mentioned. The thickness of the metal material is preferably in the range of generally 0.18 to 0.32 mm, particularly 0.22 to 0.24 mm. As the resin coating film serving as the base coat layer or underlying layer, a protective resin coating film, particularly an epoxy-phenol paint, is used which has a particularly excellent combination of adhesion, corrosion resistance and processability. A suitable epoxyphenol paint is a mixture of a bisphenol type epoxy resin with an epoxy equivalent in the range of 450 to 4000 and a resol type phenol-formaldehyde resin with a molecular weight in the range of 120 to 1000 in a ratio of 60:40 to 40:40.
It is a thermosetting paint made by mixing at a weight ratio of 90:10 and precondensing if necessary. These paints are
Coating amount as solid content for metal material is 15~
It is applied in an amount of 50 mg/dm ² and baked to form a base coat layer or underlayer. Next, printing is performed on the side that will become the outer surface of the casing by means known per se, such as lithographic printing, offset printing, screen printing, gravure printing, letterpress printing, etc., and after drying the printing ink, a layer of printing ink is applied on the printing ink layer. Apply the finishing varnish described above and bake the finishing varnish layer. The baking of this finishing varnish is such that the glass transition temperature of the finishing varnish layer is within the above-mentioned range, and is generally performed at a temperature of 165 to 175°C and for a time of 8 to 10 minutes, so that the above requirements are satisfied. Choose a condition. In the present invention, the sheet-like coated metal material thus formed is formed into a cylindrical blank. The forming of the cylindrical blank is most advantageously carried out by a welded can body forming process which is known per se. For this purpose, the paint is scraped off at the end of the painted metal material that is to become the cylindrical blank joint, or only the end that is to be the cylindrical blank joint is left free of paint. In the former method, the painted metal plate is brought into contact with an abrasive roll; in the latter method,
This is easily done by adopting the margin painting method. A painted metal plate whose edge surface is kept conductive is rolled into a cylindrical shape, its edges are overlapped, and the overlapped edges are brought into contact with a pair of electrode rollers to conduct electricity. Electric resistance welding is performed by this method. During electric resistance welding, the electrode roller and the edge are brought into contact via a wire with a tin plating layer, and the main part of the welding process is performed in a non-oxidizing atmosphere such as nitrogen gas.
A cylindrical blank is formed that maintains a metallic luster on its outer surface and has seams with excellent corrosion resistance. The outer surface of the weld seam of the cylindrical blank is coated with an organic protective coating. A suitable example of a protective paint that can be applied thickly and has excellent corrosion resistance and processability is an organosol paint, but the seam protective paint used in the present invention is of course not limited to these. The production of the cylindrical blank is not limited only to the method of forming a welded seam, but also to the method of forming a glued seam. For example, it is also possible to employ a stack bonding method using a polyamide adhesive. Part 5 to explain the manufacturing process of irregularly shaped can bodies
In Figures A, 5-B, 6-A, and 6-B, the expander 23 used for stretch molding consists of a large number of split molds (segments) 24 that are divided into many parts in the radial direction. The mold 24 has an outer circumferential surface 25 corresponding to the inner surface of the arc-shaped section 13 of the final irregularly shaped housing.
have. Each split mold 24 has a small-diameter inner circumferential surface 26 on the center side, and a hole 27 defined by the inner circumferential surface 26 extends in the axial direction. A plunger 2 having a tapered peripheral surface 28 coaxially with the hole 27
9 is provided so as to be movable in the vertical direction. An elastic mechanism (not shown) such as a spring allows each split mold 24 to be in the state shown in FIG. They have been given a restraining order that reduces them to a small state. When the plunger 29 rises, due to the wedge effect between the tapered outer peripheral surface 28 of the plunger and the inner peripheral surface 26 of the split mold, the outer peripheral surface 25 of the split mold projects outward against the restraint. It turns out. Thus, after inserting the expander split mold in the state shown in Fig. 4-A into the cylindrical blank and positioning the cylindrical blank and the split mold, the plunger 29 is press-fitted to open the outer peripheral surface of the split mold. 25
extends radially outward, and is stretched into a predetermined shape. At this time, the part that comes into contact with the outer peripheral surface 25 of the split mold becomes the arc-shaped partition part 13 shown in FIG. 2, and the part that does not contact the outer peripheral surface of the split mold is a short linear part 1.
It becomes 4. Next, when the plunger 29 is lowered, the split mold 24 returns from the state shown in FIG. 6-A to the state shown in FIG. 5-A, so that the shaped can body after molding is taken out from the expander. In the present invention, the following formula R _B = L ₁ /L ₀ ×100 In the formula, L ₀ represents the circumference of the cylindrical blank, and L ₁
represents the circumference of the maximum diameter part of the stretch molded housing, and the stretch molding ratio (R _B ) defined by is 5 to 20%.
It is desirable to set the range of 8% to 15%. In addition, in the irregularly shaped case of FIG. 1, since the diameters of the upper small diameter part 5 and the lower small diameter part 6 correspond to the diameter of the cylindrical blank, there is no difference in the circumference of the small diameter parts 5 and 6 as L ₀ . . In the present invention, after the cylindrical blank is bulged, the flange processing and seaming with the can lid can be performed, or after the cylindrical blank is flanged, the bulge processing is performed and then It can also be seamed with the can lid. Furthermore, it is also possible to perform flanging on both open ends of the cylindrical blank, perform seaming between the lower end and the lower can cover, and then perform the above-mentioned overhanging process. A lubricant having a dynamic friction coefficient of 0.05 or less is applied to at least the large-diameter can body, for example, the finishing varnish layer of the large-diameter overhang of the irregular-shaped case manufactured by the method described above.
That is, when the lubricant is in liquid form, it is applied onto the finishing varnish either directly or after being heated or diluted to adjust the viscosity. Even when the lubricant is solid or semi-solid, it can be easily applied by heating it to a liquid state or diluting it with a diluent. Any means known per se, such as spray coating or roller coating, may be used for coating, but a sufficiently satisfactory effect can be achieved even if the coating amount is within the extremely small range mentioned above. Furthermore, in order to completely prevent the inner surface of the metal material from being exposed, corrosion, and metal elution, a well-known top coat paint such as epoxy-vinyl is applied to the inner surface of the irregularly shaped housing by means such as spray coating. . The excellent effects of the present invention will be explained with the following examples. Reference example Preparation of paint Epoxy resin (Epicote 1004...manufactured by Yuka Ciel Co., Ltd., number average molecular weight 1400) and dehydrated castor oil fatty acid were adjusted to a weight ratio of 70:30, and heated at 230℃ for 5 hours in a nitrogen atmosphere. I reacted with The acid value of this reactant was 2.8. This was cooled, and when the temperature reached 120°C or lower, a solvent (Swazol 1000) was added so that the solid content was 50%. The number average molecular weight of the epoxy ester resin thus produced was 3,050. Add butylated melamine resin (Spar Betsucomin J-820) to this epoxy ester resin solution.
...manufactured by Dainippon Ink & Chemicals) with a solid weight ratio of epoxy ester resin and melamine resin of 60:40.
Add the solvent (Swazol 1000 and butyl/cellosolve weight ratio 2:1) and stir well.
was added to adjust the solids content to 47%. Example 1 Empty can manufacturing conditions A large tin plate with a thickness of 0.23 mm, hardness T1, outer tin layer #25, inner tin layer #50 was used, and the outer surface was coated with epoxy phenol paint at a thickness of 25 mg/ ^dm2 .
Baking was carried out at 190°C for 10 minutes, then an epoxyphenol paint was applied to the inner surface at a thickness of 55 mg/dm ² and baking was carried out at 205°C for 10 minutes. After printing in three colors according to the usual method on this large board with internal and external coating, it was heated to 55°C.
A finished varnish made of epoxy ester-amino resin (reference example) having a Tg point of 85 mg/dm ² was applied and baked at 170°C for 10 minutes to obtain a coated plate for irregularly shaped cases. Next, apply the actual painted board to the can body blank width 206.33
mm, height 193.80 mm, can diameter 211 diamond (65.3
A welded can with a diameter of 1.5 mm) was manufactured using a normal can manufacturing method, and at the same time, an epoxyphenol-based welded part inner surface correction paint and an alkyd/amino-based welded part outer surface corrected paint were applied, and then heated in a gas hot air oven at a peak temperature of 230°C.
A three-piece welded cylindrical can for an irregularly shaped housing was produced by baking to reach the temperature in 15 seconds. The cylinder can for this irregularly shaped case is machined using a netting processing machine to form the can end portion 209 on one end of the cylinder can, and then subjected to an overhanging machine for irregularly shaped housings so that the maximum overhang is 15% more than the diameter of the can. did. Next, flanging is applied to form 211 with an opening.
The diameter of the aluminum lid was tightened. Next, epoxy/acrylic paint was sprayed on the inside, and baked at 175°C for 4 minutes to create a one-sided, irregularly shaped can. Next, liquid paraffin was applied to the irregularly shaped can with one-sided wrapping so that the coefficient of dynamic friction was 0.03, thereby producing the desired irregularly shaped can. Pack 650g of tap water into this irregular shaped can, wrap a 209 diameter tin lid, and
Can (inner dimensions: 299mm long, 225mm wide, 187mm deep)
The product was packed into a Ratsuprand carton with the aluminum lid side facing upward, and packed for model transport tests. The packaging for this model transport test was carried out at an amplitude of 5 mm, a vibration cycle of 600 times/minute, and a vibration time of 20 minutes (Matsudaira type vibration tester UBC-4). After carrying out this test, the degree of scratches on the outer surface was observed, but there were no scratches at all as a result of the model transportation test. Example 2 According to Example 1, an external appearance investigation of irregularly shaped single-wrap cans made from finishing varnishes with different glass transition points Tg and a transportation test (Yokohama → Fukuoka → Yokohama) with different dynamic friction coefficients depending on the lubricant applied to the outer surface. We fabricated and evaluated test cans for mixed shipments.

【table】

[Table] Example 3 According to Example 1, the type of finishing varnish and the resistance to overhanging were measured at 175℃ after overhanging.
-Evaluated with a closed body (no lid tightening) after 4 minutes of heat treatment

【table】

[Table] The degree of flaws during can manufacturing is determined by the glass transition temperature.
All in good condition except for the finishing varnish with Tg47℃.

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view showing an example of the irregularly shaped housing of the present invention, FIG. 2 is a top view of the housing shown in FIG. 1, and FIG. 3 is a line A--A in FIG. 1. FIG. 4 is an enlarged cross-sectional view in the thickness direction showing the cross-sectional structure of the case, and FIG. FIG. 5-B is a top view of the expander of FIG. 5-A, FIG. 6-A is a side view of the expander in an open state, and FIG. Figure B is a top view of the expander of Figure 6-A. 1 is a can body member, 2a and 2b are double seam parts, 3
a and 3b are can lids, 9 and 11 are overhanging parts, 16 is a metal material, 17 is an organic base coat layer, 18 is an organic top coat layer, 19 is an organic base coat layer,
20 is a printing ink layer, 21 is a varnish layer, and 22 is a lubricant layer.

Claims (1)

[Scope of Claims] 1. An irregularly shaped can having a can body having a diameter larger than the lid tightening diameter, and in which the can body diameter changes in the axial direction of the can body, which includes: outside the can body; The surface has a thermosetting finish varnish layer with a glass transition temperature (Tg) in the range of 50 to 80℃, and a dynamic friction coefficient applied on the finish varnish layer of the can body with a diameter larger than the lid seam diameter. An irregularly shaped case with an outer surface coated, characterized in that a lubricant layer of 0.05 or less is provided.